One of the first rescue workers to arrive at the scene of a bus crash in Switzerland that killed 28 Belgians, including 22 children, has described the horror that awaited him.

Claude Peter, chief of the regional rescue team of Val d’Anniviers, arrived at the tunnel at Sierre, in the Swiss canton of Valais, 20 minutes after the alarm first rang at around 10pm local time on Tuesday night.

“I saw the front seats of the bus smashed one against the other; there was blood everywhere, and I could see the children who were still alive fidgeting so that someone could save them”, she said.

The wreckage of the coach

“No one was there. No policemen, no firemen. I realised there was nothing I could do alone so I called the rescue teams.”

The mother-of-two said she could still see the children's faces "I can still see all those faces looking at me, not knowing if they were dead or alive. It was horrible.”

According to local press, the rescue teams were given a debriefing session on Wednesday morning to cope with the shock.

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Swiss Coach Crash Kills 28, Including 22 Children

A rescues helicopter is airborne Rescuers work at the tunnel entrance after a bus crashed in the tunnel, in Sierre, Switzerland, early wednesday, March 14, 2012. (Photo credit: KEYSTONE/Laurent Gillieron)